Synthesis and characterization of proton conductive liquid crystals bearing phosphonic acid moieties

Add time:07/20/2019    Source:sciencedirect.com

A homologous series of mesogenic phosphonic acid derivatives (CnPA) were synthesized through the Michaelis-Becker reaction. Chemical structures of the derivatives were characterized by nuclear magnetic resonance, Fourier transform infrared spectroscopy and high-resolution mass spectrometry. Differential scanning calorimetry measurements and polarizing optical microscopic observations indicated that CnPA exhibited smectic A and nematic phases at intermediate temperatures (119–196 °C). Temperature-dependent X-ray diffraction measurements suggested that smectic CnPA formed a bilayer architecture in which phosphonic acid moieties aggregated into lamellar arrays. Electrochemical impedance spectrum measurements using indium tin oxide (ITO) electrodes revealed that the liquid crystal phases favored anhydrous proton conduction of the phosphonic acid derivatives and the proton conductivities on the order of 10−4 S cm−1 were achieved.

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